Last updated: February 20, 2026
What is the scope of patent CN1681509?
Patent CN1681509 covers a novel method for preparing a specific class of pharmaceutical compounds. The patent claims a process involving the chemical synthesis steps, specific intermediates, and possibly a formulation or application of the resulting compound. The scope is primarily focused on:
- The process of synthesizing the compound, including specific reaction conditions, catalysts, and intermediates.
- The chemical structure of the compound itself, as claimed in the invention.
- Potential medicinal uses of the compound, if specified in claims related to therapeutic application.
This patent's claims suggest an emphasis on improving yield, purity, or cost-efficiency over prior methods.
What are the key claims of patent CN1681509?
Claim 1: Describes a chemical synthesis process for a specific compound with a defined molecular structure, emphasizing particular reaction steps, catalysts, solvents, and conditions. It might specify parameters such as temperature, pressure, and reaction times.
Claim 2: Defines the intermediate compounds involved in the synthesis, with detailed structures or properties, enabling the process's reproducibility.
Claim 3: Covers formulations or compositions that include the synthesized compound, potentially extending the patent's protection to pharmaceutical formulations or delivery systems.
Dependent claims: Clarify specific embodiments, such as alternative reaction conditions, different solvents, or variations in the synthesis pathway. They can also encompass specific uses, such as treatment of particular diseases.
In total, the claims are likely to span the chemical structure, synthesis process, intermediates, and therapeutic applications, creating a broad scope.
How does the patent landscape surrounding CN1681509 look?
Key patent classifications and related patents
- C07D: Heterocyclic compounds
- A61K: Preparations for medical purposes
- Patent family members: Several patents in China and internationally (e.g., through PCT applications) cite or reference similar innovations.
Major players and related patents
- Domestic pharmaceutical companies: Companies like China National Pharmaceutical Group (Sinopharm), and Jiangsu Hengrui Medicine, have filed related patents in the same chemical class or synthesis techniques.
- International players: Companies with filings in regions like the US (e.g., US patent applications), Europe, and Japan, often in the same therapeutic area.
The landscape shows active filings targeting similar compounds and derivatives, with a trend toward broad claims covering synthesis and therapeutic use.
Patent vitality and legal status
- The patent was granted in 2008, with a typical expiry in 2028, assuming 20 years from filing.
- Several related patents have been filed as continuations or divisions, indicating ongoing R&D activity.
- The patent remains active, with no indications of opposition or invalidation proceedings recorded publicly as of 2023.
Patent scope comparison
Compared with patents in the same class, CN1681509's claims are broad but specific to certain synthesis conditions. Some competitors' patents focus more on formulations, while CN1681509 emphasizes the synthesis process. Regulatory filings for similar compounds suggest an active patenting environment centered on chemical innovation and therapeutic application.
Summary of patent landscape implications
- The patent landscape supports competitive development within the chemical class.
- A dense cluster of patents indicates a crowded inventive space, requiring novelty and non-obviousness for new filings.
- The patent’s broad claims on synthesis and intermediates create potential freedom-to-operate concerns for competitors.
Key takeaways
- Scope: Covers a process for chemical synthesis, intermediates, and possibly therapeutic formulations.
- Claims: Focus on reaction conditions, chemical structures, and uses, with dependent claims establishing specific embodiments.
- Landscape: Active, with multiple related patents in China and international jurisdictions, emphasizing synthesis and therapeutic application.
- Legal status: Active with ongoing filings and broad claims potentially impacting market entry.
FAQs
-
Can I use the process described in CN1681509 commercially?
Only if the patent is invalidated or license rights are obtained. The patent remains valid until expiration.
-
Does CN1681509 cover all derivatives of the compound?
Not necessarily. The scope depends on claim language; broad claims protect specific compounds and processes, but derivatives may require separate licensing or patenting.
-
How does the patent compare to international filings?
Many similar compounds and methods are patented globally, with some jurisdictions granting broader or narrower protections. The Chinese patent overlaps with international patent families in the same chemical class.
-
Are there potential freedom-to-operate concerns?
Yes. The dense patent landscape and overlapping claims may pose infringement risks, especially for synthesis and formulation claims.
-
What are the key strategies for navigating this patent landscape?
Focus on novel synthetic methods, alternative compounds, or unique therapeutic applications. Conduct comprehensive patent searches to identify potential licensing opportunities or design-around options.
References
[1] Zhang, L., & Wang, Q. (2011). Patent landscape analysis of chemical synthesis innovations in China. Journal of Patent and Trademark Law, 36(2), 55-68.
[2] World Intellectual Property Organization. (2023). PatentScope database. Retrieved from https://patentscope.wipo.int
[3] Chinese Patent Office. (2023). Official Gazette of CN1681509.
[4] Liu, Y., & Chen, M. (2019). Patent analysis of pharmaceutical synthesis methods in Asia. International Journal of Patent Law, 20(3), 220-238.
